The MRI sequences demonstrate:
atrophy of the left cerebral hemisphere with cystic encephalomalacia, surrounding gliosis and ex-vacuo dilatation of the ipsilateral lateral ventricle
atrophy of the left cerebral peduncle and thalamus
ipsilateral falcine displacement
compensatory thickening of the ipsilateral skull vault
enlargement of the ipsilateral frontal sinus and mastoid air cells
volume loss to the contralateral cerebellar hemisphere with gliosis, known as crossed cerebellar atrophy